Hope you know about IR meters.
Bought,
https://www.amazon.com/gp/product/B0727WYCYF/?tag=cpf0b6-20
This model has settable emissivity, for more accuracy, and came with their own emissivity chart :
https://drive.google.com/open?id=1UMTjDFyYlc7IHFkV7z1iJFmA3mNo6it7
Firstly, not sure I bought a high enough temp model. Then, reading specs, +-2C <100C , am I reading right? Then, it doesn't seem right in cold temperatures. Last night, 16F, house siding reading 12F, when house siding should have heat leakage from 68F interior and some stored IR from 1 hour prior sunlight. Snow, read 4F, and I believe, lower, if I adjusted the emissivity to proper level...I did find this morning (air temp 22F) more consistent readings holding it point blank onto siding. But while holding it in place, repeatedly measuring, the siding ir temp would rise as high as 34F, maybe even 36F (too many tests to remember)-which may be attributable to siding heat leakage getting trapped in thermometer nose cone. This rise in temperature, by holding and repeating, phenomena is not happening inside. {After seeing one Best Western painter work in 30F, in 2006 I was forced to paint 3 sides of a new house, outside and below freezing: it worked down to 28F, below, the water borne paint froze. But still not sure if heating the water-based paint or the heat leakage through the siding, is the reason "below freezing" painting works. ...Though, I did a 2008 test on my own house, put bowl of water-based paint in microwave, heated to just under boiling, painted my own side lattice in 15 F, which lasts to this day. I was astounded it didn't freeze.}...Not much luck yet getting consistent body temperature reading with this. I am guessing body ir thermometers add a few degrees, adjust for emissivity, and take more sample measurements. Temple reading at 88 emissivity set, seems to be half consistent, but half not.